Furnace.



D. 0. BERRY.

FURNACE. w u APPLICATION FILED MAR. 25, 1916. L1 1L Patented Jan. 23, 1917.

2 SHEETS-SHEET l- D. O. BERRY.

FURNACE. I I APPLICATION FILED MAR. 25. I9l6- 2 SHEETS-SHEET .boiler,

1 banter. o. annex, or cnrcaeo, rumors.

ru'nnacn.

instance.

tpecification of Letters Patent.

Application filed March 25, 1918. Serial No. WLEM.

To all whom it may concern Be it known that l, DANIEL t). BERRY, a citizen of the United States, residing at Chicago, Cook county, State of Illinois, have invented certain new ments in Furnaces, taken in connection description.

My invention relates to smoke-consuming furnaces using high orlow pressure boilers, and has for its object the production of a furnace designed to more completely utilize all of the products of combustion, thereby greatly reducing the cost of operating furnaces of this class.

A further object of my invention is to of which the following, with the drawings, is a provide means for introducing hot-air within the fire chamber to-combine with the gasesrising from the grate, which in many of the boilersand furnaces as now constructed is wasted. I accomplish this object by returning a part of the products of combustion which have been only partially con sumed, from a chamber at the rear of the through an opening in the bridge wall to zone of more complete combustion, where the gases are united with other gases passing from the fire box containing an excess of oxygen with which they are united and finally consumed. The mixture of the current returning from the combustion chamber at the rear of-the boiler with a current of highly heated gas and air passing from the fire box over the bridge wall, thoroughly consumes every part of the material not previously oxidized. I

llnthe accompanying drawings, 1 have illustrated what I now consider the preferred form of my invention, changes may be madein the proportion and minor detalls of construction without departing from the spirit of my invention, in which Y 1 Figure 1 is a vertical, longitudinal, sectional view of a furnace and boiler embody ing my invention; Fig. 2 is a vertical, transverse, sectional view, taken on line 2-2 of Fig. 1, looking in the direction of. the arrow; Fig. 3 is a horizontal, sectional view, taken and useful llmprovea compartment in which there is a although on line 3-3 of Fig. 1; Fig. 4 is a detail of the air-distributing pipe, taken on line 4-7: of Fig. 3.

In carrying out my invention, A. represents a furnace, and B a flue boiler, which 1Enay be either a high or low-pressure strucure.

B is the fire box, C the grate, C the ash pit, C the water jacket, all of which are of the usual form of construction, and will be readily understood by those familiar with the art. Entrance to the grate and to the ash pit is efiected through the openings 5, c, which are closed by doors 6, c, of the usual furnace construction.

D is the bridge wall, which extends nearly to the crown sheet (1, leaving a passageway d, between the topof said wall and the crown sheet.

d is a ledge or shoulder formed in the bridge wall and upon which one end of the grate bars C, rests. That wall, D, which extends above the ledge 0Z is inclined toward the front of the furnace,

as shown more clearly in Fig. 1. This part of the bridge wall, D, is hollow, having an air-inductionpassageway, D therein, which is provided with an fiues B The compartment E extends downwardly into the bridge wall D to the clean-out opening e at the bottom thereof. The transverse wall E rises from the rear I portion of the bridge wall D to the crown sheet, and is provided with an openings,

therethrough, at a point level with the bottom of the boiler casing D.

F is a secondary combustion chamber at the rear of and beneath the boiler through which the gases and products of combustion travel on t e way to the em't opening.

G is a passageway throu h the rear of the bridge wall from the chain er 1F, which pas- .lP'atented Jan. 23, 119th.

part of the bridge inlet opening e, at the bottom thereof and outlet openings 0', at the top thereof. A wall E sageway extends upwardly in the bridge wall and opens into the compartment E between the transversely-extending wall E to the boiler tubes B Air ducts F, F extend through the furnace wall at each side thereof entering the bridge wall and extending upwardly at each side of the fire box nearly to the top of the hollow portion of the bridge wall D. Said ducts, F, F are in communication with an air pipe F which extends horizontally across the upper portion of the fire box (shown more clearly in Fig. 3). The pipe F extends through the fire box B, in the form'of a rectangular frame, and is provided upon the forward end thereof with an elongated opening f,

upon the inside of said frame. Air entering the ducts F, F rises through the passageway in the wall upon each side of the furnace to the pipe F where it is superheated, and discharges through the opening 1"", in the fire chamber B, where it mingles with the products of combustion rising in the fire chamber. Through the ash pit C, superheated air also enters the air induction passage D through the opening e, and is discharged into the fire chamber through the openings e, e; From the drawings it will be observed that there are two currents of air discharging into the fire chamber, one through the opening f in the pipe F and the other through the o enin s e'- coming through the passageway T e confluence of these two currents results in a thorough intermingling of the oxygen with the products of combustion before passing over the bridge wall. v

The operation of the device is as follows:

The products of combustion rising in the fire box B", enter a zone of complete combustion created by the accession of the air currents flowing into said chamber from the openings 6' and f. From this chamber, said combustion products pass over the forwardly-inclined wall I), through the open- .ing between the top of said 'wall and the crown sheet (1, into a compartment between said wall and the transversely-extending wall E; thence downwardly through the opening a in said wall to the compartment E thence through the passageways between the boiler pipes to the rear combustion chamber F, at the rear'of and beneath the boiler B. The lighter gases w1ll then travel in the general direction of the draft toward the stack, the heavier gases will return toward the opening G in the bridge wall where they pass upwardly into the compartment E uniting with the fresh roducts of combustion coming from the e chamber, where by reason of the air currents heretofore described, it is supplied with an excess of oxygen, more than is necessary to completely oxidize unconsumed two combustion, so that as said combustion products leave the fire chamber they carry an excess of oxygen which is suflicient to reoxidize the heavier gases returning from the rear or secondary combustion chamber.

I claim:

1. The combination with a furnace rovided with a fire box and grate, of a bridge wall having a portion thereof extending nearly to the crown sheet of the furnace and inclined forward from the grate to the top thereof, said wall being provided with air inlet ducts, a transversely-extending wall between the first named wall and the furnace boiler, forming a compartment between said will and the boiler and between said wall and the inclined wall, a pipe communicating with said air ducts and extending horizontally across the upper portion of the fire box toward the front wall thereof, said horizontal pipe having an elongated opening on one side inside of the fire box, substantially as described.

2. In a furnace provided with a fire box and grate, the combination of a bridge wall having a forwardly-inclined wall rising nearly to the crown sheet of the furnace, and a second wall rising to the crown sheet and having an opening through the same above the bridge wall, the forwardly-inclined wall being provided with air ducts extending nearly-to the top of the fire chamber, an air ipe connecting therewith and extending into the fire chamber with a discharge opening near the front wall of the furnace, the forwardly-inclined wall being provided with an air induction passageway opening from the furnace ash pit and discharging superheated air into the fire chamber opposite the discharge opening from the air pipe, and means for creating a draft through said furnace to carry the products of combustion through the boiler, substantially as described.

In a furnace provided with an air chamber and grate, a bridge wall having partition walls rising therefrom with openings therethrough, a boiler having a combustion'cham'ber at the rear and bottom thereof, the wall of the furnace having air ducts through the sides thereof which pen into the fire chamber discharging superaaaaaa and means for reoaidizing the heavier gases after they lea we the last combustion chamber, substantially as described.

In testimon speelficatioa.

y whereof I have signed this DANIEL U. BERRY. 

